Buddleja davidii |
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butterfly-bush, orange eye, orange-eye butterfly-bush, orange-eyed butterfly-bush, summer-lilac |
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| Habit | Shrubs, 5–30 dm. |
| Stems | branched, tomentose. |
| Leaves | often with auriculate stipules; petiole 5 mm; blade ovate to ovate-lanceolate, 10–15 × 2–4 cm, base attenuate or cuneate, margins serrate or subentire, apex acute or acuminate, abaxial surface tomentose, adaxial glabrous or glabrescent. |
| Inflorescences | terminal, tapered-spicate or narrowly paniculate thyrses, 10–20 × 2–4 cm, cymes almost encircling inflorescence axis, 10–25 pairs, 3–30-flowered. |
| Pedicels | essentially absent; bracteoles present. |
| Flowers | fragrant; calyx sparsely hairy externally, tube 1.5–2 mm, lobes 0.5–1.5 mm; corolla straight, violet or pink, rarely white, often with yellow-orange eye, salverform, tube 8–10 mm, lobes suborbiculate, 2–3 × 2–3 mm; stamens inserted medially in corolla tube, included in tube; ovary ovoid, 2 mm, glabrous or puberulent; stigma clavate, 1 mm. |
| Fruits | capsules, brown, narrowly ellipsoid, 5–9 × 1.5–2 mm, glabrous or puberulent, dehiscence primarily septicidal. |
| Seeds | threadlike, 3–4 × 0.5 mm, wings long. |
| 2n | = 76. |
Buddleja davidii |
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| Phenology | Flowering May–Oct; fruiting Jul–Nov. |
| Habitat | Roadsides, railroad embankments, quarries, streambeds, landslide scars, sandy lakeshores, disturbed sites. |
| Elevation | 0–1300 m. [0–4300 ft.] |
| Distribution |
AL; CA; CT; DC; DE; GA; IL; KY; MA; MD; MI; MO; NC; NJ; NY; OH; OR; PA; RI; SC; TN; VA; WA; WV; BC; ON; Asia (China) [Introduced in North America; introduced also in Central America, South America, Europe, Africa, Pacific Islands (Hawaii, New Caledonia, New Zealand), Australia]
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| Discussion | Buddleja davidii has been designated as a noxious weed in Oregon and Washington; it is a serious invader also in England, New Zealand, and Australia. It can often form dense thickets and produce abundant seeds (N. G. Tallent-Halsell and M. S. Watt 2009). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| Parent taxa | |
| Sibling taxa | |
| Name authority | Franchet: Nouv. Arch. Mus. Hist. Nat., sér. 2, 10: 65. 1887–1888 — (as Budleia davidi) |
| Source | FNA vol. 17, p. 328. |
| Web links |
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